That's a really tough question. I love black, death, doom, stoner/sludge but some of my favorite music of all time is from the Nowregian black metal scene of the early-to-mid 1990's, so I guess black.
But I'd have to rank them:
01/18 & 01/19 -- Godspeed You! Black Emperor and Neurosis (in Montreal)
02/08 -- Dark Tranquility
04/11 -- Black Sabbath